His research focuses on computational complexity theory, algorithms, combinatorics, and finite groups, with an emphasis on the interactions between these fields.
en.wikipedia.org The second part expands on enumerative combinatorics, or the systematic numeration of objects.
en.wikipedia.org Indeed, in algebraic combinatorics, association schemes provide a unified approach to many topics, for example combinatorial designs and coding theory.
en.wikipedia.org The study of permutations of finite sets is a topic in the field of combinatorics.
en.wikipedia.org At the secondary level, topics include algebra, geometry, conics, trigonometry, probability, combinatorics and calculus.
en.wikipedia.org